Use these options to specify how the date range returns results. "Exact" means that the start and end dates of descriptions returned must fall entirely within the date range entered. "Overlapping" means that any description whose start or end dates touch or overlap the target date range will be returned.

Covering the time period from February 1942 to November 1943, the collection consists of records created or received by various staff of the Department of Mines and Resources, Surveys and Engineering Branch in the course of their activities establ...

Canada. Department of Mines and Resources. Surveys and Engineering Branch.